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havaintotornit-l@ursa.fi
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> Lähettäjä: owner-muuttuja-l_at_ursa.fi [mailto:owner-muuttuja-l_at_ursa.fi]
> Puolesta Pertti Pääkkönen
> Lähetetty: 5. syyskuuta 2007 10:45
> Vastaanottaja: muuttuja-l_at_ursa.fi
> Aihe: [muuttuja-l] Fwd: [TransitSearch] HD 17156 opportunity
>
> Terve,
>
> Tässä olisi tilaisuus potentiaalisen eksoplaneetan HD17156b
> varmennukseen.
> Kohde on korkealla Kassiopeiassa.
>
> Peittymisikkunan alku 9.9.2007 klo 18:24 UT
> Peittymisikkunan keskikohta 10.9.2007 klo 3:39 UT
> Peittymisikkunan päättyminen 10.9. klo 12:55 UT
>
> Peittymisen kesto 164 min.
> Peittymisen syvyys n. 0.01 mag.
>
> Varsinkin etelässä ehtii tulla melkein pimeää ennen peittymisikkunan
> alkua.
> Kannattaa treenata sopivaa valotustaktiikkaa etukäteen reilusti alle
> 0.01 mag
> havaintoresoluutioon pääsemiseksi (jos sää sallii).
>
> Ennustetut peittymiset tapahtuvat n. 21 vrk välein, seuraavat
> keskikohdat
> (ikkuna +/- 9 tuntia):
> 01.10.2007 klo 08:57 UT
> 22.10.2007 klo 14:15 UT
> 12.11.2007 klo 19:32 UT
> 25.12.2007 klo 06:07 UT
> 15.01.2008 klo 11:25 UT
> 05.02.2008 klo 16:43 UT
> 26.02.2008 klo 22:00 UT
> 19.03.2008 klo 03:18 UT
>
> Pertti
>
>
> ---------- Forwarded Message ----------
>
> Subject: [TransitSearch] HD 17156 opportunity
> Date: Wednesday 05 September 2007 00:45
> From: Greg Laughlin <laugh_at_ucolick.org>
> To: transitsearch_at_ucolick.org
>
> Hello Everyone,
>
> I'd like to alert the Northern Hemisphere Transitsearch.org community
> to an interesting opportunity
> for a photometric transit follow-up.
>
> The target star is HD 17156, (V=8.15, RA 02 50, Dec +71 45) which is
> orbited by an M sin(i)=3 Mjup
> planetary companion on an eccentric 21.2 day orbit (e=0.67, Omega=120
> deg). The orbital geometry
> is favorable for the occurrence of transits, with an a-priori
> probability of ~11%. About 25% of the
> transit window was covered photometrically by the discoverers before
> the planet was announced.
>
> The next opportunity is centered on HJD 2454353.65. The 1-sigma
> uncertainty in the central transit
> time is +/- 0.3 days, which is a good constraint for a candidate that
> has not been fully checked photometrically.
> A central transit is predicted to last 164 minutes, and the expected
> transit depth is of order 1%.
>
> The ephemeris table for all upcoming transits is located at:
>
> http://207.111.201.70/transitsearch/dynamiccontent/
> HD17156__b.transits.txt
>
> Accurate sky positions should be obtained from SIMBAD. More background
> on the planet
> is given in the following general-interest articles at oklo.org:
>
> http://oklo.org/?p=242
>
> and
>
> http://oklo.org/?p=240
>
> Transitsearch's ephemeris tables and candidates list are now hosted on
> the server computer that we use
> to run the systemic collaboration (at www.oklo.org), and are updated
> every 10 minutes.
>
> If you have any questions, please let me know. This should be a
> straightforward candidate for us to either
> confirm or definitively rule out.
>
> I have done a bootstrap analysis which shows the distribution of
> possible central transit times based on
> fits to the published radial velocity data. The histogram is attached
> in .pdf format:
>
> -------------------------------------------------------
>
> --
> Pertti Pääkkönen, PhD, Chief engineer
> University of Joensuu, Department of Physics and Mathematics
> Tel: +358 13 251 3238
> Fax: +358 13 251 3290
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